# N461M: Martin 404

- Status: Valid registration
- Airframe: [Martin 404](https://openairdocs.org/model/martin-404) (registry code 5450702, 52 seats)
- Engine: [Pratt & Whitney R-2800 series](https://openairdocs.org/engine/pratt-whitney-r-2800-series) (registry code 52026)
- Data sheets: [TCDS 1A7](https://openairdocs.org/tcds/1A7) (Martin-Marietta Corporation) (OpenAirDocs)
- Serial number: 14227
- Type: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Standard, transport
- Airworthiness date: February 25, 1965
- Certificate issued: May 24, 2023
- Expires: May 31, 2030
- Mode S code: A59E65
- Registered owners: [Sheppard Harold Jr DBA](https://openairdocs.org/faa-owner/SHEPPARD%20HAROLD%20JR%20DBA), [Sheppard Trucking](https://openairdocs.org/faa-owner/SHEPPARD%20TRUCKING)
- Location: [Riverton, WY](https://openairdocs.org/faa-place/WY/Riverton)
- Owner type: Individual
- Owner's area on the map: 43.0278° N, 108.2379° W: Placed by OpenAirDocs at the center of ZIP code 82501, within about 15 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=461M
- Page: https://openairdocs.org/aircraft/N461M

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Pratt & Whitney R-2800 model are included.

## ADs that may apply (OpenAirDocs): 22 in force

### Matched by airframe (Martin 404)

- [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023
- [AD 77-17-12](https://openairdocs.org/ad/77-17-12): Wing Spar Chord Splice Joints · Martin-Marietta 404. Effective Aug 30, 1977
- [AD 71-09-06](https://openairdocs.org/ad/71-09-06): Cracks In Main Gear Gland Nut · Martin-Marietta 202, 202A and 404. Effective May 4, 1971
- [AD 67-19-04](https://openairdocs.org/ad/67-19-04): Engine Mount · Martin-Marietta 202, 202A and 404. Effective Jun 20, 1967
- [AD 67-14-06](https://openairdocs.org/ad/67-14-06): Wing Inspection · Martin-Marietta 202, 202A and 404. Effective Apr 28, 1967
- [AD 66-19-03](https://openairdocs.org/ad/66-19-03): Landing Gear Cylinder Strut · Martin-Marietta 404. Effective Aug 19, 1966
- [AD 66-08-04](https://openairdocs.org/ad/66-08-04): Nose Landing Gear · Martin-Marietta 202, 202A and 404. Effective Apr 10, 1966
- [AD 64-03-03](https://openairdocs.org/ad/64-03-03): Blades · Boeing DC-6, DC-6A, DC-6B and 26 more. Effective Mar 1, 1964
- [AD 63-24-02](https://openairdocs.org/ad/63-24-02): Wing Spar Caps And Eal Doublers · Martin-Marietta 202, 202A and 404. Effective Nov 21, 1963
- [AD 63-13-04](https://openairdocs.org/ad/63-13-04): Landing Gear Piston/Axle Assembly · Martin-Marietta 404. Effective Jul 15, 1963
- [AD 61-01-02](https://openairdocs.org/ad/61-01-02): Martin-Marietta 202, 202A and 404. Effective Jan 6, 1961
- [AD 60-10-07](https://openairdocs.org/ad/60-10-07): Upper Nose Gear Torque Arm · Martin-Marietta 202, 202A and 404
- [AD 60-07-06](https://openairdocs.org/ad/60-07-06): Landing Gear Lock Plunger · Martin-Marietta 404
- [AD 57-06-02](https://openairdocs.org/ad/57-06-02): Engine Mount Stud · Martin-Marietta 202, 202A and 404
- [AD 57-03-04](https://openairdocs.org/ad/57-03-04): Zone Iii Fire Protection · Martin-Marietta 202, 202A and 404
- [AD 56-24-02](https://openairdocs.org/ad/56-24-02): Carburetors · Kelowna Flightcraft R & D 240 Series, 340, 440 and 2 more
- [AD 56-09-02](https://openairdocs.org/ad/56-09-02): Rudder Torque Tube Rivets · Martin-Marietta 202, 202A and 404
- [AD 55-20-03](https://openairdocs.org/ad/55-20-03): Nose Gear Steering Shaft · Martin-Marietta 202, 202A and 404
- [AD 55-16-02](https://openairdocs.org/ad/55-16-02): Fire Resistant Prop. Feathering Lines · Martin-Marietta 202, 202A and 404
- [AD 54-12-01](https://openairdocs.org/ad/54-12-01): Landing Gear Oleo Drag Struts · Martin-Marietta 404
- [AD 54-08-01](https://openairdocs.org/ad/54-08-01): Nose Gear Piston And Work Assembly · Martin-Marietta 202, 202A and 404
- [AD 52-16-02](https://openairdocs.org/ad/52-16-02): Propeller Reversing Rework · Martin-Marietta 404

### Matched by engine (Pratt & Whitney R-2800 series)

None in force.

### Historical (superseded or no longer in force)

- [AD 74-08-09 R2](https://openairdocs.org/ad/74-08-09-R2) (historical): Waste Receptacles · Aero Spacelines 377, 377MG, 377SGT and 268 more. Effective Jul 29, 1996

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N461M.

## FAA accident and incident reports

None matched to N461M.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs) (57, first 50)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Martin 404)

- [STC SA01967WI](https://openairdocs.org/stc/SA01967WI): Use of GAMI G100UL High Octane Unleaded Avgas. General Aviation Modifications Inc
- [STC SA3-402](https://openairdocs.org/stc/SA3-402): Floor modification, swivel seat installation and divan seat belt installation. Sabreliner Aviation LLC
- [STC SA3-403](https://openairdocs.org/stc/SA3-403): Installation of Bendix RDR-1 weather radar system, radome and relocation of airspeed pitot. Sabreliner Aviation LLC
- [STC SA3-404](https://openairdocs.org/stc/SA3-404): Installation of Sperry SP20 autopilot. Sabreliner Aviation LLC
- [STC SA3-405](https://openairdocs.org/stc/SA3-405): Installation of APU. Sabreliner Aviation LLC
- [STC SA3-418](https://openairdocs.org/stc/SA3-418): Installation of cockpit and general cabin arrangement and furnishings. Sabreliner Aviation LLC
- [STC SA107CE](https://openairdocs.org/stc/SA107CE): Installation of Hoskins Supplemental Model A high intensity wing tip lights, model C or K tail lights, with or without models 1 or 2 high intensity fuselage lights. BF Goodrich Aerospace
- [STC SA2557NM](https://openairdocs.org/stc/SA2557NM): Installation of KS Avionics EGT/CHT-2( ) combined exhaust gas and cylinder head temperature monitoring system. K S Avionics Inc
- [STC SA8075SW](https://openairdocs.org/stc/SA8075SW): Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER). Razorback Fabrics Inc
- [STC SA00228NY](https://openairdocs.org/stc/SA00228NY): Installation of Sky Harbour Aircraft Refinishing Ltd Ice Damage Prevention Plates. Sky Harbour Aircraft Refinishing
- [STC SA157NE](https://openairdocs.org/stc/SA157NE): Installation of Graphic Engine Monitor System Model GEM-602 S/N 403 and GEM-603 S/N001126and subsequent. Insight Instrument Corp
- [STC SA2-952](https://openairdocs.org/stc/SA2-952): Installation of fiberglass covering. Razorback Fabrics Inc
- [STC SA4-953](https://openairdocs.org/stc/SA4-953): Outer wings modified for installation of integral type fuel tanks. Rogerson ATS
- [STC SA3554NM](https://openairdocs.org/stc/SA3554NM): Replace passenger interior with class E cargo interior. Monarch Aircraft Inc
- [STC SA1122WE](https://openairdocs.org/stc/SA1122WE): Installation of wing flap actuated landing gear aural warning system. Northwest Airlines, Inc
- [STC SA1428WE](https://openairdocs.org/stc/SA1428WE): Installation of cargo interior. Northwest Airlines, Inc
- [STC SA4-1042](https://openairdocs.org/stc/SA4-1042): Passenger seating capacity increased to 44. Northwest Airlines Inc
- [STC SA4-525](https://openairdocs.org/stc/SA4-525): Installation of VIP P/N 106-1J engine mount core. Vibration Isolation Products Corp
- [STC SA1418SO](https://openairdocs.org/stc/SA1418SO): Replacement of rotor vanes in Airborne 211CC and 212CW vacuum pumps. (See limitations). Aircraft Products Supply Co Inc
- [STC SA1351WE](https://openairdocs.org/stc/SA1351WE): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces, with Ceconite101 material. (262A Series -12). Ceconite Inc
- [STC SA1352SO](https://openairdocs.org/stc/SA1352SO): Installation of combination lap belt and shoulder harness for existing aft facing flight attendant seat. PBA, Inc
- [STC SA4-1210](https://openairdocs.org/stc/SA4-1210): Installation of Eonnex cover on aircraft surfaces. Ceconite, Inc
- [STC SA4142WE](https://openairdocs.org/stc/SA4142WE): Removal of rear air stair door. No installation data required. Art Scholl Aviation
- [STC SA328SO](https://openairdocs.org/stc/SA328SO): Repair of corrosion damaged wing spar scarf splices. Marco Island Airways Inc
- [STC SA1744WE](https://openairdocs.org/stc/SA1744WE): Installation of oil filter assemblies. Nelson Filter
- [STC SA322SO](https://openairdocs.org/stc/SA322SO): (1) Installation of 44-seat interior, (2) rearrange44-seat interior. Aircraft may be modified under either option. Approval of option 2 requires implementation of option 1. Piedmont Aviation Inc
- [STC SA258SO](https://openairdocs.org/stc/SA258SO): Immersion heaters in oil tanks 404-2055010 for ground operation only. Piedmont Aviation Inc
- [STC SA259SO](https://openairdocs.org/stc/SA259SO): BMEP bleed system for R-2800CB-3 engines. Piedmont Aviation Inc
- [STC SA260SO](https://openairdocs.org/stc/SA260SO): Swivel seat intercostals at Station 616. Piedmont Aviation Inc
- [STC SA261SO](https://openairdocs.org/stc/SA261SO): Direct pressure actuated manifold pressure gage system. Piedmont Aviation Inc
- [STC SA268SO](https://openairdocs.org/stc/SA268SO): Manufacture replacement parts for Adel ADZ24278. Piedmont Aviation Inc
- [STC SA276SO](https://openairdocs.org/stc/SA276SO): J & H G-29-7BT generators. Piedmont Aviation Inc
- [STC SA325SO](https://openairdocs.org/stc/SA325SO): Interior changes in passenger and jump seats. Southern Airways Inc
- [STC SA329SO](https://openairdocs.org/stc/SA329SO): Replacement of cockpit door lock. Piedmont Aviation Inc
- [STC SA349SO](https://openairdocs.org/stc/SA349SO): Hydraulic regulator change. Southern Airways Inc
- [STC SA355SO](https://openairdocs.org/stc/SA355SO): Whittaker 2L333021 NLG hydraulic pressure reducer valve replaced with Hydraulics Research42028180-001 valve. Southern Airways Inc
- [STC SA375WE](https://openairdocs.org/stc/SA375WE): Ceconite 101 covering of rudder. Cooper Engineering Corporation
- [STC SA392SO](https://openairdocs.org/stc/SA392SO): Install Goodyear 9543138 wheels in place of Goodyear 9540512. Piedmont Aviation Inc
- [STC SA395EA](https://openairdocs.org/stc/SA395EA): Rear wing spar flange repaired. Piedmont Aviation Inc
- [STC SA4-1124](https://openairdocs.org/stc/SA4-1124): Taran II demonstration weather radar system. Hughes Aircraft Company
- [STC SA4-1220](https://openairdocs.org/stc/SA4-1220): Sperry A-12 autopilot system. Tempo Design Corp
- [STC SA4-1221](https://openairdocs.org/stc/SA4-1221): Radome and radar antenna. Tempo Design Corp
- [STC SA4-1229](https://openairdocs.org/stc/SA4-1229): Two 15KS-1000-A1 aircraft rocket engines. Aerojet-General Corporation
- [STC SA4-153](https://openairdocs.org/stc/SA4-153): Oil filter 30816A with CP-1438-0 element. Winslow Aerofilter Corp
- [STC SA4-1615](https://openairdocs.org/stc/SA4-1615): Interior modification. AiResearch Aivation Service Co
- [STC SA4-501](https://openairdocs.org/stc/SA4-501): Engine mount core assemblies. Dow-Elco Inc
- [STC SA4-568](https://openairdocs.org/stc/SA4-568): Engine mount core assemblies DE1468. Dow-Elco Inc
- [STC SA4-949](https://openairdocs.org/stc/SA4-949): Auxiliary power plant. Jay- Dee Aircraft Supply Co
- [STC SA4-950](https://openairdocs.org/stc/SA4-950): Sperry A-12 autopilot. Jay- Dee Aircraft Supply Co
- [STC SA4-951](https://openairdocs.org/stc/SA4-951): Furniture. Jay- Dee Aircraft Supply Co

All 57: https://openairdocs.org/aircraft/N461M/stcs.md

## Earlier aircraft with N461M

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N461M before.

- [Cancelled 1931-11-20](https://openairdocs.org/deregistered/N461M-1931-11-20): Detroit E-2A, S/N 5. Owner: [Bernard F Daily](https://openairdocs.org/faa-owner/BERNARD%20F%20DAILY), [Kankakee, IL](https://openairdocs.org/faa-place/IL/Kankakee)

## Related

- Other Martin 404 aircraft: https://openairdocs.org/model/martin-404/aircraft.md
- The Pratt & Whitney R-2800 series engine: https://openairdocs.org/engine/pratt-whitney-r-2800-series.md

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